A few WordPress questions

A few WordPress Questions

1.Has anyone created an online registration feature on their website built using WordPress?
2.Did they have a members-only section for the registration and how did members get through the gateway?
3.What plug-in was used to create the registration form?
4.What plug-in was used for PayPal?
5.Did they use the services of a WordPress consultant and were they satisfied with the result?

Any answers to these question from my friend would help

Also is it possible to put a searchable excel spreadsheet on a web site without compromising the speadsheet ie allowing the user to copy it?